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Test Info:

<body onload="test()">
<script>
function test() {
document.body.offsetWidth;
let grid = document.querySelector(".container");
grid.style = "grid-template-columns:none";
}
</script>
<style>
body {
font: 1.2em Arial, Verdana, sans-serif;
background-color: #fff;
}
.container {
display: grid;
gap: 10px;
grid-template-columns: 1fr 1fr 1fr 1fr;
grid-template-rows: auto auto auto;
}
header,
footer,
aside,
li,.box {
background-color: rgb(120, 70, 123);
border: 5px solid rgb(88, 55, 112);
color: #fff;
border-radius: 5px;
padding: 20px;
}
aside {
grid-row: 1 / -1;
grid-column: 1;
}
header {
grid-column: 2 / -2;
}
ul {
gap: 10px;
grid-row: 2;
grid-column: 2 / -1;
margin: 0;
padding: 0;
list-style: none;
display: grid;
grid-template-columns: subgrid;
}
footer {
grid-row: 3;
grid-column: 2 / -1;
}
.box {
grid-column: -2;
grid-row:1;
}
</style>
<div class="container">
<header>This is my header</header>
<div class="box"></div>
<aside>I should stretch from the top to the bottom of the grid</aside>
<ul>
<li>A</li>
<li>B</li>
<li>C</li>
<li>D</li>
<li>E</li>
<li>F</li>
<li>G</li>
<li>H</li>
<li>I</li>
<li>J</li>
<li>K</li>
</ul>
<footer>I am a footer</footer>
</div>